Ignition system of VAZ 2107: note for car owners

The ignition coil (IC) is designed to transmit a spark to the engine cylinders through high-voltage wires in order to ignite the combustible mixture. In turn, this allows the power unit to start. In this article we will tell you where the ignition coil is installed on a VAZ 2107 car and how to correctly adjust the torque at home.

Types of ignition systems VAZ 2107

The evolution of the VAZ 2107 has transformed the ignition system of this car from an unreliable mechanical design into a modern computer-controlled electronic system. Changes occurred in three main stages.

Contact ignition of carburetor engines

The first modifications of the VAZ 2107 were equipped with a contact-type ignition system. This system worked as follows. The voltage from the battery was supplied through the ignition switch to a transformer (coil), where it increased several thousand times, and then to a distributor, which distributed it among the spark plugs. Since voltage was pulsed to the spark plugs, a mechanical breaker located in the distributor housing was used to close and open the circuit. The breaker was subjected to constant mechanical and electrical stress, and it often had to be adjusted by setting the gaps between the contacts. The contact group of the device had a short resource, so it had to be changed every 20–30 thousand kilometers. However, despite the unreliability of the design, cars with this type of ignition can still be found today.

Contactless ignition of carburetor engines

Since the beginning of the 90s, a contactless ignition system was installed on carburetor VAZ 2107, where the breaker was replaced with a Hall sensor and an electronic switch. The sensor is located inside the ignition distributor housing. It reacts to the rotation of the crankshaft and sends a corresponding signal to the switching unit. The latter, based on the data received, supplies (interrupts the supply) voltage from the battery to the coil. Then the voltage returns to the distributor, is distributed and goes to the spark plugs.

Contactless ignition of injection engines

The latest VAZ 2107 models are equipped with electronically controlled injection engines. The ignition system in this case does not provide any mechanical devices at all, not even a distributor. In addition, there is no coil or commutator as such. The functions of all these components are performed by one device - the ignition module.

The operation of the module, as well as the operation of the entire engine, is controlled by the controller. The principle of operation of such an ignition system is as follows: the controller supplies voltage to the module. The latter converts the voltage and distributes it among the cylinders.

Is there a difference between contact and electronic ignition?

On carburetor VAZ 2107, both an electronic and a contact device were installed. The adjustment process is no different. The only difference may be that before setting the marks, it is necessary to clean the contacts on the contact breaker and check the gap so that the system can be adjusted more accurately.

By the way, many people mistakenly call the switch the ignition relay. This relay is only a way to reduce the inrush current and is designed to preserve the life of the contacts. This relay is located in the engine compartment. The ignition setting does not apply to it.

This is how you can adjust the ignition on a carburetor VAZ 2107. Good luck on the roads!

Ignition module

The ignition module is a device designed to convert DC voltage from the on-board network into electronic high-voltage pulses with their subsequent distribution among the cylinders in a certain order.

Design and operating principle

The design of the device includes two two-terminal ignition coils (transformers) and two high-voltage switches. The voltage supply to the primary windings of the transformer is controlled by the controller based on the information received from the sensors.

In the ignition system of an injection engine, voltage distribution is carried out according to the idle spark principle, which provides for the pairwise division of cylinders (1–4 and 2–3). A spark is formed simultaneously in two cylinders - in the cylinder in which the compression stroke is coming to an end (working spark), and in the cylinder where the exhaust stroke begins (idle spark). In the first cylinder, the fuel-air mixture ignites, but in the fourth, where the gases burn out, nothing happens. After turning the crankshaft half a turn (180 0), the second pair of cylinders enters the process. Since the controller receives information about the exact position of the crankshaft from a special sensor, problems with sparking and its order do not arise.

Location of the ignition module VAZ 2107

The ignition module is located on the front side of the cylinder block above the oil filter. It is secured to a specially designed metal bracket using four screws. It can be identified by the high-voltage wires coming out of the housing.

Factory designations and characteristics

VAZ 2107 ignition modules have catalog number 2111–3705010. As an alternative, consider products numbered 2112–3705010, 55.3705, 042.3705, 46.01. 3705, 21.12370–5010. They all have approximately the same characteristics, but when purchasing a module you should pay attention to the engine size for which it is intended.

Table: technical characteristics of the ignition module 2111–3705010

Switch

The commutator is necessary to create an electrical impulse by interrupting the constant supply of current from the battery to the primary winding of the coil. The BSZ VAZ 2107 uses a switching device of type 3620.3734. The working elements in it are ordinary bipolar transistors, which open the circuit when a signal is received from the Hall sensor.

The switch serves to generate an electrical impulse in the low voltage circuit

Switch 3620.3734 is built according to a simple single-wire circuit, in which the device body is connected to the vehicle ground and, accordingly, to the negative terminal of the battery. The advantages of using this unit instead of a traditional breaker include:

• no need for maintenance or adjustment;
• high spark energy, which makes it easier to start the engine in the cold season, as well as the ability to use gasoline with a lower octane number;
• the presence of a stabilization system that protects the Hall sensor from voltage surges.

This switch has one drawback - low production quality. It happens that the device fails after just a few months of use. Its design is non-demountable, therefore, repair is impossible. That is why experienced owners of “Sevens” and other VAZs with a contactless ignition system carry spare switches in their cars . Fortunately, the part is inexpensive - 400–500 rubles.

Table: main technical characteristics of switching unit type 3620.3734

Where in the “seven” is the switch located?

Depending on the modification and year of manufacture of the car, the switch in the VAZ 2107 may have a different location. It is usually installed on the mudguard on the left side of the engine compartment or on the engine shield. In any case, you need to look for it next to the ignition coil.

In a VAZ 2107 car, the switch can be mounted on the left mudguard or on the engine shield

Typical switch failures

The switch has only two signs of malfunction: the engine either does not start at all, or it starts but is unstable. It is impossible to determine that exactly it has failed without a thorough diagnosis, since similar symptoms may be inherent in other breakdowns.

Electronics failure

Most often, the switching device simply burns out. More precisely, one or more of its electronic elements located inside burns out. In this case, there will be no spark either on the central armored wire running from the coil to the distributor, or on the electrodes of the spark plugs.

Signal delay

It also happens that the engine starts, but runs intermittently, overheats, and periodically stalls. Similar symptoms accompany many other problems, including incorrect carburetor adjustment, fuel pump failure, clogged fuel lines, breakdown of the coil, high-voltage wires, etc. A faulty switch can cause these symptoms due to distortion of the shape of the output electrical pulses. Usually there is a delay in the signal, which leads to a shift in the moment of spark formation back.

How to check a VAZ 2107 switch

At service stations, switches are checked on a special stand using an oscilloscope. But, given the low cost of the part, it is not practical to pay for its diagnostics at a service station. At home, it will not be possible to accurately check the switching device, but there are three options for doing this without the involvement of specialists:

• using a new switch;
• through a control lamp;
• using a piece of wire.

The first option involves replacing the device with a new one or a known good one. To do this you need:

1. Remove the negative terminal from the battery.
2. Disconnect the connector from the switch being tested.
3. Connect the connector to a working switch.
4. Place the terminal on the battery.
5. Start the engine and check its operation.

   
   To check the switch, the easiest way is to temporarily replace it with a new one or a known good one and start the engine

If the engine started and began to work normally, the problem was in the switch.

To check the second method, you will need a test lamp. This is a simple device consisting of an ordinary twelve-volt car lamp and wires connected to it. Diagnostics is carried out as follows:

1. Using an 8 mm wrench, unscrew the nut on the ignition coil that secures the wire to the “K” terminal.
2. We connect the test lamp into the gap between the indicated terminal and the end of the removed wire.
3. We ask an assistant to sit behind the wheel and start the starter.

   
   To check the serviceability of the switch, you need to disconnect the wire from contact “K” and connect a test light to the open circuit

   Read also:  The VAZ 2109 gearbox is noisy and howling, why the gearbox hums, but when the clutch is depressed, the noise disappears, reasons

If the switch is working properly, the lamp should blink. This is evidence that the device reads the Hall sensor signals and periodically breaks the circuit. If the lamp lights up constantly or does not light up at all, the switch is faulty.

Video: diagnosing a switch using a lamp

The third method is the most radical. It is perfect for those drivers who are caught by a malfunction while on the road, when there is neither a new switch nor a warning lamp at hand. To implement it, you only need a piece of insulated wire with a cross-section of 0.5 mm2. The procedure is as follows:

1. Disconnect the central high-voltage wire from the distributor cover.
2. We place it on some metal component of the engine or body so that the contact of the core is next to the “ground”.
3. Disconnect the connector from the Hall sensor on the distributor.
4. We strip the ends of the wire section from insulation. We plug one of them into the central hole of the sensor connector. Turn on the ignition without starting the starter.
5. With the other end of the wire we touch the ground of the car in any convenient place. If the switch is working properly, sparking will be observed between the core of the central high-voltage wire and the ground. Otherwise, the device must be replaced.

Video: checking the switch using a piece of wire

Diagnostics of malfunctions of the ignition module of injection VAZ 2107

The ignition of the injection VAZ 2107 is completely electronic and is considered quite reliable. However, problems can arise with it too. The module plays an important role in this.

Signs of a malfunctioning ignition module

Symptoms of a faulty module include:

• the Check engine warning light on the dashboard lights up;
• floating idle speed;
• engine tripping;
• dips and jerks during acceleration;
• change in sound and color of exhaust;
• increased fuel consumption.

How to check the distributor

The most common manifestations of an ignition malfunction will be as follows:

1. floating idle;
2. engine that won't start;
3. engine stalling while driving.

Most often, the cause of this may be the distributor. The easiest way to check the performance of the ignition, including the distributor, is as follows. To do this, unscrew the spark plug, bring it to the engine and start it, observing the appearance of a spark. If it is not there, then you need to check the functionality of the high voltage wires. If there is no spark again, then the diagnosis is clear - the distributor has failed.

In this case, you need to visually check the condition of the slider, the condition of the contacts and the distributor cover. Burnt contacts are cleaned and dust and debris are removed from the internal surfaces of the distributor. In a workshop or garage, you can check the performance of the ignition and distributor using measuring instruments and indicators.

The distributor appeared on the car almost simultaneously with the gasoline engine, and for many years remained almost unchanged, including on domestic cars of the 2109, 2106, 2107, 2108 family. And only after the advent of a modern element base, which includes the Hall sensor, gave way to contactless and then microprocessor ignition systems. » alt=»»>

Replacing the ignition module of a VAZ 2107

In case of malfunction, it is better to replace the ignition module with a new one. Repair is possible only if the breakdown is not a break or short circuit of the windings, but a visible violation of any connection. Since all the conductors in the module are aluminum, you will need special solder and flux, as well as certain knowledge from the field of electrical engineering. However, no one can guarantee that the device will work flawlessly. Therefore, it is better to buy a new product that costs about a thousand rubles and be sure that the problem with the ignition module has been solved.

Even an inexperienced car enthusiast can replace the module independently. The only tools you will need is a 5mm hex wrench. The work is performed in the following order:

1. Open the hood and disconnect the negative terminal from the battery.
2. Remove the air filter housing, find the ignition module and disconnect the high voltage wires and the wiring harness block from it.
3. Use a 5mm hex to unscrew the four screws securing the module to its bracket and remove the faulty module.
4. We install the new module and secure it with screws. We connect the high-voltage wires and the wire block.
5. We connect the terminal to the battery and start the engine. We look at the instrument panel and listen to the sound of the engine. If the Check engine light goes out and the engine runs stably, everything is done correctly.

Video: replacing the ignition module of a VAZ 2107

Thus, it is quite simple to determine the malfunction and replace the failed ignition module with a new one with your own hands. To do this, you only need a new module, a 5-point hexagon and step-by-step implementation of the instructions from specialists.

VAZ 2107 injector, also known as the “seven”, is the latest model from the line of VAZ cars with rear wheel drive. “Seven” was created on the basis of the VAZ 2105 with significant differences: engine power, appearance of lighting devices, interior design, and seat shape. In this article we will look at the main parameters, functions, malfunctions, pros and cons of the injection VAZ 2107, in particular the ignition system.

Photo VAZ 2107

Candles

The spark plug's job is to create a powerful electric spark to ignite the air-fuel mixture. The basis of the candle design is:

• a central electrode through which high voltage current flows;
• ceramic insulator;
• threaded part (skirt);
• side electrode

What spark plugs are used in the BSZ VAZ 2107

In electronic BSZ it is recommended to use spark plugs of the following manufacturers and types:

• A17DV and their modifications (Russia, Engels, ZAZS);
• BP-6 E (Japan, NGK);
• W20-EP (Japan, DENSO);
• L15Y (Czech Republic, BRISK);
• W-7D (BERU Germany, BERU).

  
  The interelectrode gap for spark plugs for BSZ should be in the range of 0.7–0.8 mm

Table: main characteristics of BSZ spark plugs

The principle of operation of the VAZ 2107 injection engine

The injection system's operating methods are fundamentally different from the operating principles of the carburetor system, in which the air-fuel mixture is prepared in the carburetor chamber. In the VAZ 2107 injection engine, the fuel mixture is injected directly into the cylinders. For this, it received the name “distributed injection system”.

Injection systems are characterized by their operating principle and the presence of different numbers of injectors. The “seven” is equipped with a separate injection system with 4 nozzles. That is, injection occurs in each cylinder, which is controlled by a microcontroller of the electronic engine control unit. Using special-purpose sensors, information about the operating mode, gas pedal position and other important parameters is read. Based on this, there is a controlled flow of fuel into the cylinders.

How to set up contactless ignition using tags?

This method is not much different from the previous one, but this time the first cylinder is used. There are marks on the large crankshaft oil seal cover, and on the pulley itself there are marks. You need to turn the mechanism so that the mark on the crankshaft coincides with the middle mark and does not move to the side.

The further procedure is similar to the previous one: install the distributor and collect the elements.

After complete assembly, it is necessary to check the operation of the system. Otherwise, the installation will not work properly.

What are the advantages of VAZ 2107 injection models?

• The VAZ 2107 injection engine consumes less fuel. At the same time, it is more powerful than a carburetor engine with the same volume. This is achieved through the optimal formation of the qualitative and quantitative composition of the fuel mixture. Accordingly, the efficiency of an injection engine is higher than that of a carburetor.

• Thanks to electronic speed control, the engine runs more reliably at idle, stalls less when starting, and starts well at low ambient temperatures.

• Compared to a carburetor engine, an injection engine does not require frequent adjustments to the ignition and fuel supply systems.

• The air-fuel mixture that enters the cylinders has the most favorable composition. And the existing catalyst controls the minimum amount of harmful exhaust gases. This plays a big role in preserving the environment and taking care of health.

• There is no need to manually adjust the mechanism, since this is done by the hydraulic chain tensioner and hydraulic valve clearance compensators. They also guarantee less noise (noise insulation) when the engine is running.

• Torque graphics are “smooth”, a larger rpm range allows high torque to be achieved.

WORTH NOTICE! On an engine with an injection system, it is possible to install gas-cylinder equipment not only of the 2nd, but also of the 4th generation. This is a more modern and attractive option, since the installation of the 4th generation of gas equipment provides greater savings and reduces the occurrence of “pops” in the engine to zero.

How to set the seven on a carburetor

The VAZ 2107 traces its origins to the Fiat 124 and was produced in Russia until 2012

Installation Tools

For all work carried out we will need:

• key to 38;
• open-end or socket wrench 13;
• a 12 V control light with two wires attached to it (each wire is approximately 20 cm long).

The key for turning the crankshaft is designed for more careful alignment of the marks

How to work with tags correctly

There are three marks on the engine block next to the crankshaft pulley, each with its own length. You can feel these marks from the driver's side, but only strictly with the engine not running, since the pulley rotates at high speed when the engine is running! The shortest of them will mean that the ignition is advanced by 10 degrees or 10 degrees to the top dead center of the piston in the cylinder, the middle mark by 5 degrees and short - 0 degrees. You can also feel the slot on the pulley, and even on a VAZ 2107 (carburetor) this mark is sometimes implemented differently, but the main task is to find it.

Ignition timing marks

Step-by-step description with photos and diagrams

1. If during the work you accidentally messed up the ignition setting, then do not rush to remove the valve covers to understand when the compression stroke begins. Do the following: remove the spark plug in the first cylinder and plug the hole with a small, tight plug made from a rag soaked in water. Having made sure that no one is standing nearby and will not be harmed by the impromptu plug flying out, in short series we turn the crankshaft with the starter for literally a split second, turning the starter on and off, and at the moment when the plug flies out with a characteristic sound from the spark plug hole, we stop turning the starter.
2. Now, turning the crankshaft a little at a time by the pulley nut with a 38 wrench, we ensure that the marks on the pulley and the cylinder block coincide with the middle mark, which means 5 degrees.
3. We unhook the latches from the distributor cover and look at the direction of the slider: when it is positioned as in the photo, then half the job is already done. If not, then use an open-end wrench or a 13-socket wrench to unscrew the nut, remove the distributor and put everything back in the required position.
4. We make a mark with a marker on the cylinder block to further optimize the ignition settings.
5. Now we connect our light bulb with one wire to the positive terminal of the ignition coil, and the second wire to ground. We remove the central wire of the coil from the distributor cover and fix it at a distance of approximately 1-5 mm from ground. This is done in order to prevent breakdown of the ignition coil to ground.
6. Having turned on the ignition, slowly turn the ignition distributor housing (distributor) in the direction of movement clockwise and watch when the light goes out. If it didn’t burn, then we leave everything as is.
7. Slowly rotate the distributor housing in the opposite direction, until the light comes on and use a 13 key to secure the housing.
8. Turn off the ignition, return the distributor cap and the central wire to their place. Unhook the wires of the control lamp.

Disadvantages of injection models of the VAZ 2107 engine

Of course, as usual, in addition to the advantages of the injection “seven”, there are also negative aspects, which consist in the following situations:

• Problematic access to some components due to the location of the engine and other mechanisms under the hood in the same format as in older models. Although at the same time, the system providing fuel injection is reliable and does not require frequent maintenance during operation.

Photo of VAZ 2107 under the hood

• The injection VAZ 2107 is equipped with a catalyst, which is very easy to damage when driving on a bad road with large bumps and obstacles. In such cases, of course, you need to be careful when driving on problematic roads.

Photo of VAZ 2107 catalyst

• The presence of an injection engine increases the requirements for fuel quality, in contrast to the carburetor version. If you use low-quality gasoline, you cannot avoid clogging the fuel system. This leads to unplanned vehicle maintenance.

• If the injection system breaks down, it is not possible to repair it yourself in a garage. Here you only need to contact professionals at a specialized service station.

Contactless systems and Hall sensor in the distributor

The distributor described above is a classic version and was used for many years on all cars, including the VAZ family, such as 2109, 2106, 2107, 2108. However, as electronics developed, voltage switches began to appear in which the breaker signal was used not for switching the ignition coil, but for controlling the electronics. Later, the distributor lost its mechanical breaker and was replaced by a Hall sensor.

The Hall sensor used has a fairly simple design. Yes, it must be recalled that the Hall sensor is an element that responds to a magnetic field. Therefore, the design of the sensor using Hall elements is based on this principle. To do this, a Hall sensor is located directly on the plate, on the other side there is a permanent magnet, and between them there is a rotating metal screen in which special slots are made.

When the screen blocks the field from the installed magnet, the Hall sensor has zero voltage at the output; when windows are opened instead of a solid screen, the Hall sensor generates a high voltage at the output. The distributor transmits this generated sequence of pulses to the voltage switch, and it controls the ignition coil.

At one time, a similar system was implemented in many cars, VAZ 2109, 2106, 2107, 2108 were no exception.

Malfunctions of VAZ 2107 injection engines

Malfunctions of the VAZ 2107 injection engine make themselves felt by the manifestation of the following problems:

• Engine operation becomes unstable and unstable; • Fuel consumption increases significantly; • The quantitative content of carbon dioxide in the exhaust increases; • When you press the gas pedal, dips appear; • Engine power decreases, the engine stops “pulling”.

Troubleshooting the injection system requires special equipment. For example, to determine the correct operation of sensors and engine ECUs and determine error codes, special software with a computer, a tester, is required. For this reason, diagnostics and repair of the “seven” injector should be carried out at professionally equipped service stations. A common cause of injector malfunctions is clogged injectors themselves.

Causes of clogging of the VAZ 2107 injector

Poor quality gasoline mainly causes problems with the injection system. This gasoline contains a high amount of heavy paraffins. They leave deposits on the walls of the fuel system, clogging it and making it difficult to supply fuel. When producing high-quality gasoline, special additives (detergents) are added that destroy such deposits. Low-quality gasoline contains a very high amount of paraffins that detergents do not have time to cope with their deposits.

Checking the ignition system elements

Misfires in engine operation, especially in wet weather, are a consequence of breakdown of the insulation of high-voltage wires. There should be no cracks or damage in the wire insulation. You can check the insulation for breakdown using a wire connected to ground. If you run it along the insulation while the engine is running, a spark will be observed in places with damaged insulation. Another clear sign of poor insulation is noticeable electric shocks when touching high-voltage wires while the motor is running.

A broken high-voltage wire can be easily determined with an ohmmeter. The resistance should be between 3-10 kOhm. The spread of indicators between the wires should be no more than 1-2 kOhm.

Operating principle of the distributor

In many ways, the operating principle of the distributor remained unchanged for many years. In VAZ cars, such as VAZ 2109, 2106, 2107, 2108, an ignition system of this type was used almost until the end of the last century.

The basis of the work is the connection of the distributor with the engine crankshaft . When the piston in the first cylinder takes the position corresponding to TDC, the breaker contacts open, a high voltage appears in the ignition coil, directed through a slider located in the distributor cover to the spark plug of the first cylinder.

There the combustion of the fuel assembly occurs, and the crankshaft continues to rotate. In addition to moving the pistons, it causes the breaker cam to rotate. When in another cylinder another piston occupies a position corresponding to TDC, at this moment the breaker contacts in the distributor open again, and a high-voltage voltage is generated in the ignition coil and supplied to the desired spark plug.

This combined rotation of the crankshaft, the breaker cam and the distributor slider ensures that a spark appears where and when needed. However, this does not cover all aspects of how the distributor works. To understand its operation, it is necessary to touch upon such concepts as the angle of the closed state of contacts (UZSK) and the ignition timing angle (IAF)

A concept such as UZSK characterizes the time when the breaker contacts are closed. In essence, this is an indirect characteristic of the accumulation of energy in the coil after the completion of spark formation. UZSK directly affects the amount of energy spent on sparking and, accordingly, on engine operation.

In cases where the distance between the contacts is small, the coil will not accumulate the necessary energy and the spark energy will be low, which will lead to interruptions in the operation of the motor. A large gap also leads to interruptions, since the contact breaking time is reduced and the coil does not have time to fully discharge.

Each ignition system has its own optimal UZSK, to ensure which, if necessary, the distributor must be checked and adjusted.

This concept concerns the moment of ignition of a fuel assembly. The fact is that its combustion does not occur instantly, and often, to ensure optimal conditions for such a process, it must begin earlier than the piston reaches the TDC position. The OZ characterizes the time by which the appearance of a spark precedes the appearance of the piston in the TDC position.

It is constantly changing, and its value completely depends on the operation of the motor under specific conditions, i.e. depending on the load, vehicle speed, quality and type of fuel used. To ensure optimal combustion of the fuel assembly, the distributor contains a centrifugal regulator and is also connected to a vacuum regulator.

Signs of breakdown

When the ignition is turned on, the engine ECU malfunction indicator light comes on, and after the engine is started, it should go out. A burning warning light is the first sign of problems with the ignition system. Other prerequisites for diagnosing the ignition module are “floating” engine speed and problems with starting. The cause of such failures may be faulty high-voltage wires or spark plugs, so you need to make sure they are working before you start diagnosing the ignition of the VAZ 2107 (injector). Often, cylinder misfires occur due to compression problems or damage to the intake manifold gasket. This must be taken into account when searching for the causes of engine failure.

What does the distributor consist of?

A device such as a distributor includes a large number of different parts. It is not the purpose of this material to consider their purpose, but you can see what components the distributor consists of in the figure below

As can be seen from the figure, the distributor consists of several independent units. And if the purpose and operating principle of the voltage distributor unit are simple and clear, then you can familiarize yourself with the work of others in more detail. However, it is advisable to check the condition of the high-voltage distributor and slider each time the car is serviced.

Centrifugal regulator

Such a device determines the moment when fuel assemblies begin to burn in the engine cylinders. As already noted, a spark initially appears when the piston reaches the TDC position, and it is at this moment that the distributor is initially adjusted. However, two points need to be taken into account:

• Combustion of fuel assemblies occurs at a constant speed, starting from the spark plug and then spreading further throughout the volume of the cylinder. Combustion does not occur instantly, and the greatest efficiency of a gasoline internal combustion engine is achieved when the piston has passed TDC and reached BDC (bottom dead center).
• When the engine is running, the crankshaft speed changes; increasing it reduces the time required for efficient combustion of the fuel assembly.

Checking the ignition coil

The coil is checked based on two indicators: the presence of a short circuit and an open circuit. Before diagnostics, the ignition coil must be disconnected. After this, one probe of the device is connected to the central contact of the coil, the second to the body (ground). If the display shows resistance equal to infinity, there is no short circuit.

The primary winding of the coil for a break occurs differently. The probes of the device must be connected to the right and left contacts. The resistance between them should be within 3-3.5 Ohms.

If the resistance of the primary winding does not correspond to the norm or there is a short circuit in the coil to the housing, it must be replaced.

Ignition adjustment

The injection modification of the VAZ 2107 does not require adjustment of the ignition timing. The electronic control unit, using a sensor, determines the optimal ignition timing. The participation of the car owner in adjusting the operation is limited to setting the engine timing belt to the marks.

To check the performance of the ECU and the functionality of the sensors, it is necessary to connect a computer with specialized software. In this way, the cause of most electronic ignition system malfunctions can be determined.

It is also worth checking the operation of the throttle position sensor yourself. When the throttle is closed, the voltage on the sensor should be no higher than 0.55 volts, and when fully open - 4.5 volts. Measurements must be made with a voltmeter with the ignition on.